媒体录音机声音质量差
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【中文标题】媒体录音机声音质量差【英文标题】：Media recorder sound have poor quality 【发布时间】：2020-11-12 22:15:00 【问题描述】：我尝试做的是在将声音上传到 Firebase 后录制声音 然后检索到recclerview，我可以控制 播放/停止和进度。喜欢WhatsApp的音频消息
AudioPlayer 类在 Main 活动中通过按 按钮并返回值以在firebase中上传文件。它的工作 但音质很差，只能在浏览器或 直接在源文件夹中，否则我无法以其他格式播放 THREE_GPP 只是当我直接在源文件夹中播放时。
public class StartRecordMessage extends AppCompatActivity implements Runnable
private static String fileName = null;
private MediaRecorder myAudioRecorder;
private MediaPlayer player = null;
private boolean permissionToRecordAccepted = false;
private String[] permissions = Manifest.permission.RECORD_AUDIO;
private final String TAG = "StartRecordMessageClass";
private String audioName = null;
private String externalStoragePath,externalOutputPath,storagePath;
public StartRecordMessage(MediaRecorder myAudioRecorder)
this.myAudioRecorder = myAudioRecorder;
@Override
public void run()
startRecording();
public String startRecording ()
myAudioRecorder = new MediaRecorder();
myAudioRecorder.reset();
myAudioRecorder.setAudiosource(MediaRecorder.AudioSource.MIC);
myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
myAudioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
externalStoragePath = Environment.getExternalStorageDirectory().getAbsolutePath();
externalOutputPath = externalStoragePath + File.separator + "/android/data/test.mp3";
myAudioRecorder.setOutputFile(externalOutputPath);
else
storagePath = Environment.getDataDirectory().getAbsolutePath();
myAudioRecorder.setOutputFile(storagePath + "/Android/data/test.mp3");
try
Log.i(TAG, "--------------recording started confirmed" + externalOutputPath + storagePath );
myAudioRecorder.prepare();
myAudioRecorder.start();
catch (IllegalStateException e)
// TODO Auto-generated catch block
e.printStackTrace();
catch (IOException e)
// TODO Auto-generated catch block
e.printStackTrace();
if (externalOutputPath.isEmpty())
return storagePath;
else
return externalOutputPath;
Follow 方法在主要活动中
@Override
public void onRecordingCompleted()
Log.i(TAG, "---------completed");
startThread = new Thread(new StartRecordMessage(myAudioRecorder));
startThread.start();
startRecordMessage = new StartRecordMessage(myAudioRecorder);
audioMessage = startRecordMessage.startRecording();
Log.i(TAG, "recordingCompleted--------------" + audioMessage);
UploadSound(audioMessage);
messageListAdapter.notifyDataSetChanged();
音频播放器类
public class AudioPlayer
public static void play(Context ctx, String path)
try
final AudioManager audioManager = (AudioManager) ctx.getSystemService(Context.AUDIO_SERVICE);
final int currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
final MediaPlayer mediaPlayer = MediaPlayer.create(ctx, Uri.parse(path));
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener()
@Override
public void onCompletion(MediaPlayer mp)
if (!audioManager.isWiredHeadsetOn())
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, AudioManager.FLAG_VIBRATE);
mp.release();
);
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener()
@Override
public void onPrepared(MediaPlayer mp)
if (!audioManager.isWiredHeadsetOn())
int volume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC) / 2;
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, volume, AudioManager.FLAG_VIBRATE);
mp.start();
);
catch(
Throwable e)
Log.i("AudioUtil", "Unable to play: " + path, e);
适配器类
holder.playStop.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
clickCount++;
if (clickCount==1)
isPlayng=true;
holder.playStop.setBackgroundResource(R.drawable.ic_pause);
Log.i(TAG,"audio url---------------" + audio);
audioPlayer = new AudioPlayer();
audioPlayer.play(context,audio);
Log.i(TAG, "Media player ------------"+ clickCount + " is play: " +isPlayng);
if (clickCount>1)
isPlayng=false;
clickCount=0;
holder.playStop.setBackgroundResource(R.drawable.ic_play);
Log.i(TAG, "Media player ------------" + clickCount + " is play: " + isPlayng);
);
当我想播放声音时触发跟随错误。班上 在适配器类中调用音频播放器类，但问题是 网址。
https://firebasestorage.googleapis.com/v0/b/chat-b18d3.appspot.com/o/Audio%....。 2020-11-12 22:59:44.739 2621-2621 I/AudioUtil：无法播放：https://firebasestorage.googleapis.com/v0/b/chat-b18d3.appspot.com/o/Audio%....。 java.lang.NullPointerException：尝试调用虚拟方法'java.lang.Object android.content.Context.getSystemService(java.lang.String)' 为空 对象引用 在 com.example....ChatRecord.AudioPlayer.play(AudioPlayer.java:13) 在 com.example.chatMapOriginal.Profile.Chat.MyGroups.GroupChatAdapter$1.onClick(GroupChatAdapter.java:137) 在 android.view.View.performClick(View.java:7192) 在 android.view.View.performClickInternal(View.java:7166) 在 android.view.View.access$3500(View.java:824) 在 android.view.View$PerformClick.run(View.java:27592) 在 android.os.Handler.handleCallback(Handler.java:888) 在 android.os.Handler.dispatchMessage(Handler.java:100) 在 android.os.Looper.loop(Looper.java:213) 在 android.app.ActivityThread.main(ActivityThread.java:8178) 在 java.lang.reflect.Method.invoke（本机方法） 在 com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)
【问题讨论】：
请不要对您的文本使用强调/引用模式 【参考方案1】：尝试在您的媒体文件中添加值。
例子。
// Setup values for the media file
ContentValues values = new ContentValues(4);
long current = System.currentTimeMillis();
values.put(MediaStore.Audio.Media.TITLE, "audio file");
values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current / 1000));
values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp");
values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath());
ContentResolver contentResolver = getContentResolver();
// Construct uris
Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Uri newUri = contentResolver.insert(base, values);
// Trigger broadcast to add
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));
Toast.makeText(this, "Added File " + newUri, Toast.LENGTH_LONG).show();
此代码来自here
【讨论】：
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